abcs

A libabacus front end for the command-line.

Syntax

Please see the libabacus documentation (external/libabacus/README.md) for a guide through the syntax.

Implementation

abcs uses GNU MPFR for its number implementations. It keeps 200 digits of precision, and displays up to 50. By default, 3 digits are displayed. The request_precision function can be used to request more digits to be displayed.

RC File

abcs loads, by default, an .abcsrc file in the same directory in which it is run. It parses the whole file ingoring newlines and spaces, and evaluates it in order. The RC file can be used to specify constants or declare functions that the user wants to re-use between sessions.

Provided Functions and Operators

Operator	Function	Precedence
<	lt	1
<=	lte	1
==	equals	1
>	gt	1
>=	gte	1
+	plus	2
-	minus	2
*	times	3
/	divide	3
^	pow	3
-	negate	(prefix)
!	factorial	(postfix)

Function	Description
lt	less than comparator.
lte	less than or equal comparator.
equals	equality comparator.
gt	greater than comparator.
gte	greater than or equal comparator.
plus	addition function.
minus	subtraction function.
times	multiplication function.
divide	division function.
pow	exponentiation function
negate	flip sign of number.
factorial	factorial via the gamma function.
ln	natural logarithm function.
exp	e to the nth power function.
sqrt	square root function.
sin	trigonometric sine function.
cos	trigonometric cosine function.
tan	trigonometric tangent function.
arcsin	trigonometric inverse sine function.
arccos	trigonometric inverse cosine function.
arctan	trigonometric inverse tangent function.
quit	quits the REPL.
request_precision	requests the given number of digits to be displayed in the REPL.